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Subjects
Civil defense
11
History
5
Decontamination of food
4
Chemical decontamination
2
Decontamination
2
Education
2
Evacuation
2
Food storage
2
Military
2
Traffic control
2
Agriculture
1
Antichemical-protection service
1
Arab-Israeli war
1
Arms race
1
Army
1
Arts
1
Aviation
1
Biography
1
Biological warfare
1
Camouflaging
1